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This could also just attach an equipment you control, like the giant CMC 1 hammer with Equip 8. Makes it loose flying though :-D
"Thieving Skydiver" just steals a cheap artifact (Sol Ring, Mox, Signet, Ozolith, ...). And if the opponent makes the mistake of playing equipment, they will be beaten up by their own equipment.
A 2/1 Flying body is better than most people think.